I think I have Spyware or a Trojan, please help

While I was internetting I accidentally clicked on a pop-up and some Avast alarms went off (I think they were spyware alarms or something). ..I closed Firefox and ran a scan, and it says that I have no viruses. When I went to the virus chest there were 3 files there:
winsock.dll, kernel32.dll andwsock32.dll.
When I scan them it says that there are no viruses in them, and if I delete them they're still there the next time I scan.
I installed Hijack this. ..I don't know if there is any special way of installing it or not, so I just put in on my desktop and ran it. Also, if I download the files that are infected and replace the old ones with the new ones, will it work? ..Anyways here's the log...

I HAVE VISTA;NO PROBLEMS with VISTA - it's on for 24 hours.
BAD things can happen with HijackThis.
Go to www.kaspersky.com
Scan your Drive(slowly) with Online Kaspersky tool(FREE)
-Did you Upgrade from XP to VISTA?
-Did you use an OEM version?
-What speed is your Processor?
-How much RAM and what speed?
*****ONLY Under-Educated "experts" put down VISTA*****
FOLLOW MICROSOFT HARDWARE RULES ; VISTA WORKS.
You do not need HijackThis 2-find out what background progams are running. Let me know on what Kaspersky FINDS.
best regards

I noticed you got some good and professional help from the nice guys over at ozzu.

As was mentioned there.. these are core system files and often seem to turn up in the avast virus chest without any harmful effects. The jury is still out on whether vista is vulnerable to most of the XP virus and trojan attacks. The first big mass virus release targeted at the "escalation of priveleges" exploits that are obvious in vista will tell all.

@ mysticgek.. You think vista is brilliant.. I'm sorry to disagree, but 80% of computer professionals don't think so, and the remainder don't see any need to use it... It's not an upgrade, it's a hollywood enforced lockout.. You want to be locked into a DRM filled world where every patch and click is reported, and every non licensed media file disables parts of your hardware? Fine, just don't come crying for help when it happens.. because the professionals will just say "Told you so, but you are too thick to listen"